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5191 | serge | 1 | /* List implementation of a partition of consecutive integers. |
2 | Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. |
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3 | Contributed by CodeSourcery, LLC. |
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4 | |||
5 | This file is part of GCC. |
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6 | |||
7 | GCC is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 2, or (at your option) |
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10 | any later version. |
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11 | |||
12 | GCC is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |||
17 | You should have received a copy of the GNU General Public License |
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18 | along with GCC; see the file COPYING. If not, write to |
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19 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, |
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20 | Boston, MA 02110-1301, USA. */ |
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21 | |||
22 | /* This package implements a partition of consecutive integers. The |
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23 | elements are partitioned into classes. Each class is represented |
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24 | by one of its elements, the canonical element, which is chosen |
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25 | arbitrarily from elements in the class. The principal operations |
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26 | on a partition are FIND, which takes an element, determines its |
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27 | class, and returns the canonical element for that class, and UNION, |
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28 | which unites the two classes that contain two given elements into a |
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29 | single class. |
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30 | |||
31 | The list implementation used here provides constant-time finds. By |
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32 | storing the size of each class with the class's canonical element, |
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33 | it is able to perform unions over all the classes in the partition |
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34 | in O (N log N) time. */ |
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35 | |||
36 | #ifndef _PARTITION_H |
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37 | #define _PARTITION_H |
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38 | |||
39 | #ifdef __cplusplus |
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40 | extern "C" { |
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41 | #endif /* __cplusplus */ |
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42 | |||
43 | #include "ansidecl.h" |
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44 | #include |
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45 | |||
46 | struct partition_elem |
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47 | { |
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6324 | serge | 48 | /* The next element in this class. Elements in each class form a |
49 | circular list. */ |
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50 | struct partition_elem* next; |
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5191 | serge | 51 | /* The canonical element that represents the class containing this |
52 | element. */ |
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53 | int class_element; |
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54 | /* The number of elements in this class. Valid only if this is the |
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55 | canonical element for its class. */ |
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56 | unsigned class_count; |
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57 | }; |
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58 | |||
59 | typedef struct partition_def |
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60 | { |
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61 | /* The number of elements in this partition. */ |
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62 | int num_elements; |
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63 | /* The elements in the partition. */ |
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64 | struct partition_elem elements[1]; |
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65 | } *partition; |
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66 | |||
67 | extern partition partition_new (int); |
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68 | extern void partition_delete (partition); |
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69 | extern int partition_union (partition, int, int); |
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70 | extern void partition_print (partition, FILE*); |
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71 | |||
72 | /* Returns the canonical element corresponding to the class containing |
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73 | ELEMENT__ in PARTITION__. */ |
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74 | |||
75 | #define partition_find(partition__, element__) \ |
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76 | ((partition__)->elements[(element__)].class_element) |
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77 | |||
78 | #ifdef __cplusplus |
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79 | } |
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80 | #endif /* __cplusplus */ |
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81 | |||
82 | #endif /* _PARTITION_H */ |